Norwegian TV2 reports that Breivik belongs to "right-wing circles" in Oslo. Swedish news site Expressen adds that he has been known to write to right-wing forums in Norway, is a self-described nationalist and has also written a number of posts critical of Islam.

A Twitter account for Breivik has surfaced, though it only has one post, this quote from philosopher John Stuart Mill: "One person with a belief is equal to the force of 100 000 who have only interests." The tweet was posted on July 17.

On a Facebook account that Norwegian media outlets have attributed to Breivik, he describes himself as having Christian, conservative views. He says he enjoys hunting, the games World of Warcraft and Modern Warfare 2, and lives in Oslo. He also lists political analysis and stock analysis as interests.